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Chemistry 1997 JAMB Past Questions

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41

 \(\frac{1}{2}\)N\(_2\)(g)  +   \(\frac{1}{2}\)O\(_2\)(g) → NO(g)  ∆H° =  89 KJ mol\(^{-1}\). If the entropy change for the reaction above at 25°C is 11.8 J mol\(^{-1}\), calculate the change in free energy. ∆G°, for the reaction at 25°C?

  • A. 88.71 KJ
  • B. 85.48 KJ
  • C. -204.00 KJ
  • D. -3427.40 KJ
View Answer & Discuss (19) JAMB 1997
42
Use the graph above to answer this question. A sample, X, solid at room temperature, was melted, heated to a temperature of 358 K and allowed to cool as shown in OPQR. The section PQ indicates that X is
  • A. a mixture of salts
  • B. a hydrated salt
  • C. an ionic salt
  • D. a pure compound
View Answer & Discuss (5) JAMB 1997
43
Use the graph above to answer this question. A sample, X, solid at room temperature, was melted, heated to a temperature of 358 K and allowed to cool as shown in OPQR.The section OP suggests that X is in the
  • A. liquid sate
  • B. solid/liquid state
  • C. solid state
  • D. gaseous state
View Answer & Discuss (8) JAMB 1997
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44

In the diagram above the gas Y could be

  • A. hydrogen chloride
  • B. oxygen
  • C. carbon (IV) oxide
  • D. chlorine
View Answer & Discuss (7) JAMB 1997
45

The IUPAC nomenclature of the organic compound with the above structural formula is

  • A. 3-ethyl-2,5-dimethylhexane
  • B. 4-ethyl-2,5-dimethylhexane
  • C. 3-ethyl-2,5,5 - trimethylpentane
  • D. 3-ethyl, 1,1,4-trimethylpentane
View Answer & Discuss (28) JAMB 1997
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